Converts parts of ios/web to ARC

ios/web/navigation/crw_session_entry.mm

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/navigation/crw_session_entry.h"
 
 #include <stdint.h>
 
 #include <memory>
 
-#include "base/mac/objc_property_releaser.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ios/web/navigation/navigation_item_impl.h"
 #include "ios/web/navigation/nscoder_util.h"
 #include "ios/web/public/navigation_item.h"
 #include "ios/web/public/web_state/page_display_state.h"
 #import "net/base/mac/url_conversions.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace web {
 // Keys used to serialize web::PageScrollState properties.
 NSString* const kSessionEntryPageScrollStateKey = @"state";
 NSString* const kSessionEntryScrollOffsetXKey = @"scrollX";
 NSString* const kSessionEntryScrollOffsetYKey = @"scrollY";
 NSString* const kSessionEntryMinimumZoomScaleKey = @"minZoom";
 NSString* const kSessionEntryMaximumZoomScaleKey = @"maxZoom";
 NSString* const kSessionEntryZoomScaleKey = @"zoom";
 
 // Keys used to serialize navigation properties.
@@ skipping 13 matching lines @@
 
 @interface CRWSessionEntry () {
   // The original URL of the page.  In cases where a redirect occurred, |url_|
   // will contain the final post-redirect URL, and |originalUrl_| will contain
   // the pre-redirect URL.  This field is not persisted to disk.
   GURL _originalUrl;
 
   // The NavigationItemImpl corresponding to this CRWSessionEntry.
   // TODO(stuartmorgan): Move ownership to NavigationManagerImpl.
   std::unique_ptr<web::NavigationItemImpl> _navigationItem;
-
-  base::mac::ObjCPropertyReleaser _propertyReleaser_CRWSessionEntry;
 }
 // Redefine originalUrl to be read-write.
 @property(nonatomic, readwrite) const GURL& originalUrl;
 
 // Converts a serialized NSDictionary to a web::PageDisplayState.
 + (web::PageDisplayState)pageDisplayStateFromDictionary:
         (NSDictionary*)dictionary;
 // Serializes a web::PageDisplayState to an NSDictionary.
 + (NSDictionary*)dictionaryFromPageDisplayState:
         (const web::PageDisplayState&)displayState;
 // Returns a readable description of |displayState|.
 + (NSString*)descriptionForPageDisplayState:
         (const web::PageDisplayState&)displayState;
 @end
 
 @implementation CRWSessionEntry
 
 @synthesize originalUrl = _originalUrl;
 
 - (instancetype)initWithNavigationItem:
     (std::unique_ptr<web::NavigationItem>)item {
   self = [super init];
   if (self) {
-    _propertyReleaser_CRWSessionEntry.Init(self, [CRWSessionEntry class]);
     _navigationItem.reset(
         static_cast<web::NavigationItemImpl*>(item.release()));
     self.originalUrl = _navigationItem->GetURL();
   }
   return self;
 }
 
 - (instancetype)initWithCoder:(NSCoder*)aDecoder {
   self = [super init];
   if (self) {
-    _propertyReleaser_CRWSessionEntry.Init(self, [CRWSessionEntry class]);
     _navigationItem.reset(new web::NavigationItemImpl());
 
     // Desktop chrome only persists virtualUrl_ and uses it to feed the url
     // when creating a NavigationEntry.
     GURL url;
     if ([aDecoder containsValueForKey:web::kSessionEntryURLKey]) {
       url = GURL(
           web::nscoder_util::DecodeString(aDecoder, web::kSessionEntryURLKey));
     } else {
       // Backward compatibility.
@@ skipping 68 matching lines @@
   [aCoder encodeObject:_navigationItem->GetPostData()
                 forKey:web::kSessionEntryPOSTDataKey];
   [aCoder encodeObject:_navigationItem->GetHttpRequestHeaders()
                 forKey:web::kSessionEntryHTTPRequestHeadersKey];
 }
 
 // TODO(ios): Shall we overwrite EqualTo:?
 
 - (instancetype)copyWithZone:(NSZone*)zone {
   CRWSessionEntry* copy = [[[self class] alloc] init];
-  copy->_propertyReleaser_CRWSessionEntry.Init(copy, [CRWSessionEntry class]);
   copy->_navigationItem.reset(
       new web::NavigationItemImpl(*_navigationItem.get()));
   copy->_originalUrl = _originalUrl;
   return copy;
 }
 
 - (NSString*)description {
   return [NSString
       stringWithFormat:
           @"url:%@ originalurl:%@ title:%@ transition:%d displayState:%@ "
@@ skipping 59 matching lines @@
   return
       [NSString stringWithFormat:kPageScrollStateDescriptionFormat,
                                  displayState.scroll_state().offset_x(),
                                  displayState.scroll_state().offset_y(),
                                  displayState.zoom_state().minimum_zoom_scale(),
                                  displayState.zoom_state().maximum_zoom_scale(),
                                  displayState.zoom_state().zoom_scale()];
 }
 
 @end